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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beb032c0a60e419fe76dd8cedd1fd7ec128ff82ea97fcf228101ff374ff24a28' 
  AND token = 'mPEqa4k5s9ZzjPLV5W+92tWuie5M8aWQ7lLQjrYR3CQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}